<div name="div-block-content-<?php echo $block_model->id; ?>">
    <?php echo CHtml::label(Block::getLabel($block_model, 'menu_id'), ''); ?>
    <?php
    echo CHtml::dropDownList("Block[menu_id]", $block_model->menu_id, MenuBlock::findMenu(), array(
        'id' => 'Block-menu_id',
    ));
    ?>
    <?php echo $form->error($model, 'menu_id'); ?>
</div>